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-   -   Found a factor? Enshrine, embalm and entomb it here! (RU "Выкрасить и выбросить")) (https://www.mersenneforum.org/showthread.php?t=13977)

 markr 2011-01-27 14:41

Three very nearly in a row!

M2909701 has a factor: 34116886410693051247
k = 3 * 41^2 * 1913 * 607697

M2909749 has a factor: 165757446506320718519
k = 7 * 2417 * 7477 * 225157

M2909827 has a factor: 17618623784616481399
k = 3^3 * 257 * 281 * 1552643

All in P-1 stage #2, B1=105000, B2=2283750, E=6.
I keep thinking I should reduce the bounds...

 alpertron 2011-01-27 16:53

ECM testing in M800xxx area

After running 220 ECM curves with B1=50000 for 12 numbers in the M800xxx area I found:

M800123 has a factor: 39697452239411289096120887
M800131 has a factor: 1236262353488699154645983
M800351 has a factor: 499211152072761829658937337
M800731 has a factor: 42794895872489861161754233

 KingKurly 2011-01-27 17:09

[QUOTE=alpertron;249972]After running 220 ECM curves with B1=50000 for 12 numbers in the M800xxx area I found:

M800123 has a factor: 39697452239411289096120887
M800131 has a factor: 1236262353488699154645983
M800351 has a factor: 499211152072761829658937337
M800731 has a factor: 42794895872489861161754233[/QUOTE]
How'd you settle on 220 as the number of ECM curves to run? (Just curious) Normally I see 1, 3, and 150.

 alpertron 2011-01-27 17:17

You can change the [B]worktodo.txt[/B] file in order to do that. My idea was to complete the 25-digit level.

 KingKurly 2011-01-27 17:36

[QUOTE=alpertron;249975]You can change the [B]worktodo.txt[/B] file in order to do that. My idea was to complete the 25-digit level.[/QUOTE]
Ah, okay. I knew how to do it, I just wasn't sure why you had chosen 220, now I understand, thank you.

In an unrelated note, I've been doing a bunch of P-1 in the M198xxxx range and found some factors, if I have a chance I'll post them later. I hope to finish them ASAP because I hadn't yet figured out how to reserve exponents, but I did ensure that they weren't already reserved at the time I selected this range. I saw some people doing ECM in the M196xxxx and I hope to finish off any remaining unreserved exponents before they reach me. Now that I know how, in the future, I will ensure that all exponents are properly reserved. But I think I will be done with the unreserved ones in the next 24-48 hours, so I am not going to bother getting assignment IDs for them I suppose...

I just reserved M1979xxx (about 30 exponents) and will probably keep working my way around the upper portions of the 1.9M range -- as I mentioned, from now on, I will be reserving exponents in advance.

 alpertron 2011-01-28 12:01

Another result in this area (5 factors from 13 numbers = 38% efficiency):

M800971 has a factor: 289524442699835508796196072489

 firejuggler 2011-01-28 12:39

thanks to mfackt....

[quote]
M80622803 has a factor 156127704855377865257
M80547619 has a factor 164225854090231111921
M80623813 has a factor 74358285257003853433
M80465149 has a factor 205346902306982285351
M80645441 has a factor 74037992691676741151
M80429911 has a factor 33776959888323700737
M80625551 has a factor 110687074647006079529
M80589031 has a factor 46693727088018753713
M79154843 has a factor 68788380075731936863
M80701741 has a factor 57218973166606961263
M80309303 has a factor 118578090508483702721
M80696089 has a factor 66027939754284563593
M80699447 has a factor 47032613446676890273
M80630159 has a factor 5856285027082755031
M80700929 has a factor 44381842139698978511
M80701553 has a factor 45527575148762247041
M80624041 has a factor 37515177594283365607
M80581283 has a factor 70717839619935960241
M80701561 has a factor 55672736219070980281
M80650799 has a factor 51454583621456883601
M77224867 has a factor 39977700267067630681
[/quote]
in the last few days, all by TF

 drh 2011-01-28 13:08

TF -

M80076611 has a factor: 306028098438561259951

 KingKurly 2011-01-30 03:24

I just finished with the M198xxxx range. Most of them previously had P-1 with B1=B2=40000, and I did them all to B1=1000000, B2=30000000... kinda arbitrarily selected bounds, but they were fairly successful. I found 19 factors in 215 tests (8.84% success rate), with eight factors in Stage 1 and eleven factors in Stage 2.

[CODE] [FONT=Courier New, monospace]M1980023 has a factor: 13571695065543008351 (Stage 2)[/FONT]
[FONT=Courier New, monospace]M1980247 has a factor: 1028007425734913593231 (Stage 2)[/FONT]
[FONT=Courier New, monospace]M1980523 has a factor: 11068436810055540356047 (Stage 2)[/FONT]
[FONT=Courier New, monospace]M1981409 has a factor: 437425184457765488071 (Stage 1)[/FONT]
[FONT=Courier New, monospace]M1981493 has a factor: 98629747385844827351 (Stage 2)[/FONT]
[FONT=Courier New, monospace]M1982989 has a factor: 6724437055332257192401 (Stage 1)[/FONT]
[FONT=Courier New, monospace]M1983503 has a factor: 186794246935371583225132033 (Stage 2)[/FONT]
[FONT=Courier New, monospace]M1983643 has a factor: 341312694343914135923033 (Stage 1)[/FONT]
[FONT=Courier New, monospace]M1983913 has a factor: 31641965132080519849 (Stage 2)[/FONT]
[FONT=Courier New, monospace]M1984069 has a factor: 1899812306079643525511 (Stage 2)[/FONT]
[FONT=Courier New, monospace]M1985849 has a factor: 930999806671532321831 (Stage 2)[/FONT]
[FONT=Courier New, monospace]M1985887 has a factor: 243125032539991259230127 (Stage 2)[/FONT]
[FONT=Courier New, monospace]M1986199 has a factor: 2956613317747890929 (Stage 1)[/FONT]
[FONT=Courier New, monospace]M1986337 has a factor: 31682922079570461988879 (Stage 1)[/FONT]
[FONT=Courier New, monospace]M1987693 has a factor: 16044916528780756946806361 (Stage 1)[/FONT]
[FONT=Courier New, monospace]M1988669 has a factor: 4129291590996270537719 (Stage 1)[/FONT]
[FONT=Courier New, monospace]M1988887 has a factor: 5280340350328940238497 (Stage 1)[/FONT]
[FONT=Courier New, monospace]M1989643 has a factor: 95213757966946302721 (Stage 2)[/FONT]
[FONT=Courier New, monospace]M1989671 has a factor: 10604060702216236539257 (Stage 2)[/FONT][/CODE]

 NBtarheel_33 2011-01-31 19:45

P-1 stage 2

M60004691 has the stage 2 P-1 (91.52-bit, and prime) factor 3551945791320808519293061121.

 ckdo 2011-01-31 21:14

P-1 stage 1

M8338709 has a factor: [SIZE=2]1011726731761493320698321583

90 bits. Prime. k=3^3*19*53*83*191*479*2269*129497. Stage 1. :whistle:
[/SIZE]

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